Time needed: 5 minutes.
Find a stair where you can at least take 5-6 steps so the time spent on turning around is as short as possible
- Walk up stairs
As fast as you can without actually runnig
Do not hold the railing to challenge balance
- Walk down stairs
Slower so this is the recovery part of the interval
As many times as it takes to get your pulse up
A normal walk up and down stairs, in this case to warm up
Legs and butt.